They refined crude oil into various petroleum products.他们将原油提炼成各种石油产品.ABout 90 % of the waxes in commerce are recovered by dewaxing petroleum.工业用蜡中约有90%是由石油中回收的.The petroleum exploration geologist working with subsurface...
Is there an alternative to traction for a broken leg?对于腿部骨折有什么方法替代牵引治疗吗？He spent six weeks in traction after he broke his leg.他腿部骨折后做了六个星期的牵引治疗。We may continue the traction up to three weeks, until the fracture is healed...
Democracy survived the Civil War and the developing industrial leviathan and struggled on into the twentieth century.民主经历了内战和庞大工业体系的逐渐兴起仍然幸存了下来，并且艰难挺进了20世纪。Civil rights officials say there may be hundreds of other cases ...